Roof Anatomy
What is Valley?
Roofing Glossary · Roof Anatomy
Definition
The internal angle formed where two sloping roof sections meet, creating a V-shaped channel that directs rainwater from both surfaces down to the gutters. Valleys are high-risk areas for leaks and require special flashing, open or woven valley installation, or ice-and-water shield beneath the shingles.
Related Roofing Terms
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Valley FlashingA sheet metal or membrane lining installed in the valley of a roof to create a watertight channel fo...
→FlashingThin strips of impervious metal — typically galvanized steel, aluminum, or lead — installed at joint...
→Ice and Water ShieldA self-adhering, waterproof membrane installed on the roof deck in vulnerable areas — typically the ...
→HipThe external angle formed where two sloping roof sections meet at the sides of a hip-style roof. Unl...
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